// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/ozone/public/ozone_platform.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/trace_event/trace_event.h"
#include "ui/events/devices/device_data_manager.h"
#include "ui/ozone/platform_object.h"
#include "ui/ozone/platform_selection.h"
#include "ui/ozone/public/ozone_switches.h"

namespace ui {

namespace {

    bool g_platform_initialized_ui = false;
    bool g_platform_initialized_gpu = false;

}

OzonePlatform::OzonePlatform()
{
    DCHECK(!instance_) << "There should only be a single OzonePlatform.";
    instance_ = this;
    g_platform_initialized_ui = false;
    g_platform_initialized_gpu = false;
}

OzonePlatform::~OzonePlatform()
{
    DCHECK_EQ(instance_, this);
    instance_ = NULL;
}

// static
void OzonePlatform::InitializeForUI()
{
    CreateInstance();
    if (g_platform_initialized_ui)
        return;
    g_platform_initialized_ui = true;
    instance_->InitializeUI();
    // This is deliberately created after initializing so that the platform can
    // create its own version of DDM.
    DeviceDataManager::CreateInstance();
}

// static
void OzonePlatform::InitializeForGPU()
{
    CreateInstance();
    if (g_platform_initialized_gpu)
        return;
    g_platform_initialized_gpu = true;
    instance_->InitializeGPU();
}

// static
OzonePlatform* OzonePlatform::GetInstance()
{
    DCHECK(instance_) << "OzonePlatform is not initialized";
    return instance_;
}

// static
void OzonePlatform::CreateInstance()
{
    if (!instance_) {
        TRACE_EVENT1("ozone",
            "OzonePlatform::Initialize",
            "platform",
            GetOzonePlatformName());
        scoped_ptr<OzonePlatform> platform = PlatformObject<OzonePlatform>::Create();

        // TODO(spang): Currently need to leak this object.
        OzonePlatform* pl = platform.release();
        DCHECK_EQ(instance_, pl);
    }
}

// static
OzonePlatform* OzonePlatform::instance_;

} // namespace ui
